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$N_{\rm eff}$ in low-scale seesaw models versus the lightest neutrino mass
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abstract
We evaluate the contribution to $N_{\rm eff}$ of the extra sterile states in low-scale Type I seesaw models (with three extra sterile states). We explore the full parameter space and find that at least two of the heavy states always reach thermalisation in the Early Universe, while the third one might not thermalise provided the lightest neutrino mass is below ${\mathcal O}(10^{-3}$eV). Constraints from cosmology therefore severely restrict the spectra of heavy states in the range 1eV- 100 MeV. The implications for neutrinoless double beta decay are also discussed.
Forward citations
Cited by 3 Pith papers
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Low-scale seesaw with flavour and CP symmetries $\unicode{x2013}$ from colliders to leptogenesis
For four flavour-symmetry cases, this paper maps heavy-neutrino lifetimes, decay flavour ratios, and the parameter space where leptogenesis works and colliders can test it.
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Archimedean Seesaw: Small Neutrino Masses and Large Lepton-number Violation
A texture-zero seesaw model allows large lepton-number violation together with naturally small neutrino masses by protecting the light neutrino with an accidental symmetry.
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